From 277103e07fbe22fc8e4361bacd5c6b48133f3ba5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bernhard=20=C3=9Cbelacker?= <bernhardu@vr-web.de>
Date: Sun, 27 Jul 2014 08:38:59 -0700
Subject: [PATCH] video4linux2: Avoid a floating point exception

This avoids a segfault in avconv_opt.c:opt_target when trying to
determine the norm.

(cherry picked from commit dc71f1958846bb1d96de43a4603983dc8450cfcc)
Signed-off-by: Diego Biurrun <diego@biurrun.de>
---
 avconv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/avconv.c b/avconv.c
index 212d948905..4c57753d32 100644
--- a/avconv.c
+++ b/avconv.c
@@ -4212,7 +4212,8 @@ static int opt_target(OptionsContext *o, const char *opt, const char *arg)
             for (j = 0; j < nb_input_files; j++) {
                 for (i = 0; i < input_files[j].nb_streams; i++) {
                     AVCodecContext *c = input_files[j].ctx->streams[i]->codec;
-                    if (c->codec_type != AVMEDIA_TYPE_VIDEO)
+                    if (c->codec_type != AVMEDIA_TYPE_VIDEO ||
+                        !c->time_base.num)
                         continue;
                     fr = c->time_base.den * 1000 / c->time_base.num;
                     if (fr == 25000) {